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But that is exactly what happened when Nitro Circus roared into Glasgow, and two people ended up leaving in an ambulance.

The action sports stunt show led by motocross legend Travis Pastrana arrived at the SSE Hydro in Glasgow for another blockbuster show featuring the best dirt bike, BMX and general big air insanity full of noise, fumes and fireworks.

You know it’s dangerous when it kicks off with a tribute to Erik Roner, the former colleague who died in a skydiving stunt.

The show then introduced Bruce Cook, a motorbiker who damaged his spine and was left paralysed after a stunt went wrong, and who was going to attempt a backflip in a modified bike which he operated only with his hands, with legs strapped inside.

And then out came BMX star Jaie Toohey who had snapped his leg twice trying a crazy whip move. Both starred in gruesome slo-mo injury videos to gross out and delight the crowd.

The audience watched while the volunteers were given medical treatment.

They completed their comeback jumps safely this time to massive cheers.

But less successful was the four man backflip attempt, which saw three apparent volunteers emerge from the crowd to join pro rider Cam Sinclair on the bike.

The bike roared up the kicker ramp and then seemed to stall, then teetered off the side in an appalling heap of bike and riders which was followed by the terrible sight of an army of medics, roadies and crew sprinting to the scene in panic.

In the end, two of the passengers, who it appears may now have been stunt men instead of audience members, were taken to hospital,